深部开采全煤硐室围岩变形机理及底鼓控制技术

Surrounding Rock Deformation Mechanism and Floor Heave Control Technology of Full Seam Chamber in Deep Coal Mining

为解决深部开采全煤硐室支护困难的问题,根据胡家河煤矿特厚煤层物理力学特征,采用理论分析、数值模拟和现场观测方法研究了深部全煤硐室围岩力学特征及变形破坏机理,提出了锚网喷砌碹、底部超挖反拱钢筋网梁、底锚杆综合支护技术。现场观测结果表明:井底车场水仓硐室所测各断面顶底板累计移近量最大值为20mm,移近速度为1.2～2.0mm/d,两帮累计移近量最大值为36mm,移近速度为2.0mm/d。通过增强顶板、两帮支护强度和反拱控底可以提高底板承载能力和支护结构的整体性,有效控制了深部矿井软弱底板全煤硐室剧烈底鼓。

In order to solve the support difficult problem of the full seam chamber in deep coal mining, according to the physical and mechanics features of the ultra thick seam in Hujiahe Mine, a theoretical analysis, numerical simulation and site observation method were ap- plied to the study on the surrounding rock mechanics features and deformation failure mechanism of the full seam chamber in the deep min- ing and a comprehensive mutual compensative support technology with the bolt/steel mesh/shotcreting/lining, floor over excavation/re- versed arch/reinforce bar/steel mesh/beam and floor bolt was provided.The site observation results showed that the max accumulated con- vergence between the roof and floor in the water sump chamber was 20 mm, the convergence velocity between the roof and floor was 1.2 2.0 mm/d,the max accumulated convergence between the two sidewalls was 36 mm, and the convergence velocity between the two side- walls was 2 mm/d.With the reinforcement of the roof and two sidewall support strength and the reversed arch floor control, the floor loading capacity and the support structure integrity could be effectively improved and the serious floor heave deformation of the soft floor in the full seam gateway of the deep mine could be effectively controlled